Methods and apparatus utilize hybrid automatic repeat request (HARQ) transmissions and retransmissions that are usable on multiple carriers, i.e. joint HARQ processes. For example, a downlink (DL) shared channel transmission of a joint HARQ process is received on one of the carriers. A first part of an identity of the joint HARQ process is determined by using HARQ process identity data received on a shared control channel. A second part of the joint HARQ process identity is determined using additional information. The joint HARQ process identity is then determined by combining the first part and the second part. A WTRU is provided that is configured to receive the DL shared channel and to make the aforementioned determinations. A variety of other methods and apparatus configurations are disclosed for utilizing joint HARQ processes, in particular in the context of DC-HSDPA.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A wireless transmit/receive unit (WTRU) comprising: receiver configured to receive a first downlink control information (DCI) format that is legacy DCI format that does not include component carrier information; the receiver further configured to receive a configuration message that indicates that the WTRU is to receive a second DCI format indicating a component carrier; and the receiver is further configured to receive a HARQ transmission over the indicated component carrier of the second DCI format.
2. The WTRU of claim 1 wherein a physical downlink control channel (PDCCH) search space is associated with the second DCI format.
3. The WTRU of claim 2 wherein the PDCCH search space is a WTRU specific search space.
4. A method for receiving downlink control information at a wireless transmit/receive unit (WTRU), the method comprising: receiving a first DCI format that is legacy DCI format that does not include component carrier information; receiving a configuration message that indicates that the WTRU is to receive a second DCI format indicating a component carrier; and receiving a HARQ transmission over the indicated component carrier of the second DCI format.
5. The method of claim 4 wherein a physical downlink control channel (PDCCH) search space is associated with the second DCI format.
6. The method of claim 5 wherein a PDCCH search space is associated with the at least one second DCI format.
7. The method of claim 5 wherein the PDCCH search space is a WTRU specific search space.
8. An evolved NodeB (eNB) comprising: a transmitter configured to transmit a first downlink control information (DCI) format that is legacy DCI format that does not include component carrier information; the transmitter further configured to transmit a configuration message that indicates that a wireless transmit/receive unit (WTRU) is to receive a second DCI format indicating a component carrier; and the transmitter further configured to transmit a HARQ transmission over the indicated component carrier of the second DCI format.
9. The eNB of claim 8 wherein the at least one circuit transmits the DCI in a physical downlink control channel (PDCCH) search space associated with the at least one second DCI format.
10. The eNB of claim 8 wherein the PDCCH search space is a WTRU specific search space.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
February 25, 2013
April 15, 2014
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